Automatic fuse setting apparatus



June 20, 1944. (:HAPPELL ETAL 2,351,743

AUTOMATIC FUSE SETTING APPARATUS Filed May 5, 1945 3 Shee ts-Sheet 1 R. R. CHAPPELL ETAL 2,351,743

June 20, 1944.

AUTOMATIC FUSE SETTING APPARATUS Filed May '5, 1943 3 Shets-Sheet 2 v k I. L 5:: III j MANUAL RELAY s21 sass awn-cw men 3 E SWIT RED GREEN u'a m- RELAY INVENTORS RuidefB-(Z'Olt RaZ /L zaclm eelz BY I ggy 111d A TO NEY June ,1944; R. R. CHAPPELL ETAL 235-11943 AUTOMATIC FUSE SETTING APPARATUS Filed May 5, 1943 3 Sheets-Sheet 3 a I I 13w 8: 5 3 a E 5 1 m V) 1a n a Q V) I 0 Q I 0 I o N 1 N f R T s Q N f N O I h 2 Q a \9 7 N g a 2 m: m Q Q. %'Q r: 015.5 Y

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K T Pal 1L Rc/m pezz ATTORNEY Patented June 20, 1944 UNITED STATES PATENT OFFICE AUTOMATIC FUSE SETTING APPARATUS Ralph R. Chappell, Richmond, Va., and Rutger B.

Colt, Baltimore, Md., assignors to Bendix Aviation Corporation, New York, N. Y., a corporation of Delaware Application May 5,1943, Serial No. 485,780

20 Claims.

onating the shell charge is to use a time fuse,

which is a fuse detonating the explosive at a predetermined time after the discharge of the projectile from the gun barrel. As difierent conditions of operation necessitate different trajectories, the time fuse is made adjustable to accommodate the requirements of the various conditions. The time fuse is usually set by rotating a fuse ring relative to the body of the shell and is adjusted for various times by adjustment of the fuse ring to corresponding predetermined angular positions. In addition, the fuse design is such that for one position of the fuse ring, the detonator and the explosive are isolated from each other, and this position of the fuse ring is known as the "Safety position. The fuse ring is maintained in the safety position at all times, until immediately before insertion of the shell in the breech of the gun in which it is to be employed.

In recent years, projectiles of the above type have found wide employment in anti-aircraft ammunition, and due to the rapid and evasive action of the target, necessitating continuous changing of the fuse settings of the projectiles to be employed, there has appeared an urgent need for a fuse setter which will quickly and accurately set the fuses of the projectiles employed in accordance with the director data. Manual setting and setting by manually operated machines have been found deficient in action against modern high-speed aircraft. Further, it has been found necessary to standardize the time elapsing between the receipt of the director data and the discharge of the shell, as unless this time is standardized no accurate prediction of the target position when the shell reaches the desired range can be made. Standardization of this time is inherently difilcult in manually operated fuse setting apparatus because of the variable qualities of the human element. Also, upon the cessation of firing, an unfired shell thereof usually remains in the breech of the gun which must be removed and the fuse thereof set to safety position. An automatic fuse setter should preferably have means for performing the safety reset operation.

One of the principal objects of the invention is to provide a new and novel fuse setter for setting projectile fuses in accordance with remotely derived and transmitted data.

A further object of the invention is to provide automatic fuse setting apparatus with a standardized setting time.

Another object of the invention is to provide automatic fuse setting apparatus with a load operated switch for controlling the setting operation.

Yet another object of the invention is to provide automatic fuse setting apparatus in which the setting operation is controlled by the relative angular position of the setting members independently of the absolute angular position thereof.

Still another object of the invention is to provide automatic fuse setting apparatus in which the fuse ring is completely disengaged from the driving mechanism upon the completion of the setting operation.

A still further object of the invention is to provide automatic fuse setting apparatus with means for setting the fuses to safety position independently of the director data supplied thereto.

The above objects and advantages of the invention are accomplished by providing relatively movable reference and set rings with means for engaging the body and fuse ring of a projectile respectively, means for disengaging said set ring from said fuse ring when said reference ring and said set ring are in a predetermined angular position, means for preventing said disengagement in the absence of load on said reference and said set rings, and means for preventing said disengagement until said reference ring and said set ring have revolved relativelythrough a predetermined minimum angle.

Other objects and advantages of the invention will in part be disclosed and in part be obvious when the following specification is read in conjunction with the drawings in which:

Figure l is an exploded isometric view showing the details of the mechanism.

Figure 2 is a detail view of the load operated pawl switch.

Figure 3 is a schematic diagram showing the connections of the electrical circuits and elements employed in conjunction with the apparatus.

Figure 4 is a sectional view of a completed fuse setter constructed in accordance withthe teachings cf the invention. V

Figure 5 is a drawing showing in detail a portion of the mechanism for disengaging the driving connection between the set ring and the projectile fuse ring V In the drawings like parts are designated by like reference characters.

Referringnow to Figure 1, there is shown the motor I provided with pinion 2 driving the plane- I tary case 3. The planetary pinions 4 and 6 ro-' tate on shafts supported by the upper and lower members of the case 3, Pinions 4 and 5 are of different diameters and mesh respectively with the set sun ring 6 and with the reference sun ring 1.. The reference sun ring I is provided with a resilientl mounted pawl 9 and a second resiliently mounted pawl 9 is carried by the set ring 6. Pawl 8 is termed the reference pawl and pawl 9, the set pawl.

Pawl '9 controls the switch In shown in greater detail in Figure 2. The pawl 9 is pivotally mounted on the pawl carrier I I supported from the set ring 6 by the spring l2. A movable switch contact Illa is carried by an extension of the pawl 9 and upon counterclockwise rotation of the pawl 9 about its pivotal mounting, moves into engagement with the adjacently located fixed switch contact lb. The set ring 6 normally rotates counterclockwise and so long as pawl 9 is unloaded, the switch Upon the pick-up of load by pawl 9, this portion of the assembly rotates about the pivot, closing the switch I0. The cooperation of this load operated pawl switch with the remainder of the apparatus will be later described.

The set'take-off gear I3 is aflixed to the set ring 6 by the screws I4 and rotates therewith. The gear I3 is provided with insulated annular conducting members I 5 electrically connected with the switch contacts Illa and lob of the pawl switch I 0 and engaged by the cooperating brushes I6 through which the electrical energy is transferred to the remainder of the apparatus.

cause a complete revolution of the casing of planetary 2| which has the conventional spur gear internal construction. As a result, the abof the planetary 2I corset ring 6 and the reference ring 1 independently .of their absolute angular positions.

The pawl 9 is provided with a sloping face, and directly above is located a hold-out member 26 or, as it may also be called, a knock-out member, normally engaging this face and displacing the pawl 9 radially outwards. linked to the plunger The member 26 is 21 by the latching p l 28 75 I0 is in the open'positionr ring I continues its rotations .until .action' of the spring brake I1,

hinged to the lever 29. Upon the insertion of a projectile with the reference notch 3| and the set notch 32, the nose 33 thereof engages plunger 21 forcing it upward, thereby lifting the member 26 from its normal position and permitting the pawl 9 to move radially inward under the influence of the spring I2. the rod 34 on member 26 engages the bell crank 35 causing it to actuate switch. 36 which energizes the motor I' through suitable relay circuits to be later described. The motor I then drives the planetary case 3 clockwisewhich, due to the I9 and the relative sizes of pinions 4 and 5 drives the reference ring 1 ma clockwise direction. The reference the pick-up of load by pawl 8 through the engagement ofthe notch 3|, whereupon ring I becomes stationary and set 'ring'6 begins counterclockwise rotation. As the, pawl 9 engages the slot 32 in the fuse ring, the additional load closes switch III in the manner above outlined. The fuse ring 32 is then continuously rotated with respect to the projectile 30 until the motor I is disengages the slot 32.

Inthe normal sequence of operations, pawl 9 is disengaged from slot 32 by the return of the hold-out member 26 to its normal position, The

a rod 34 mounted on member 26 is surrounded byv of dial pointer 48 responds to the relative angular position of the v g and the rest of 31 having the lower end fixed apparatus and the upper end a restoring spring to the case of the provided with a cap which is displaced by the rod 34. The displacement of member 26 by in-v sertion of the projectile 30 puts spring 31 under tension but the member 26 is constrained to fol-' low the movements of the push rod 2'! by the action of the latching pawl 28. This pawl is normally held in engagement with a flange at the top of member 26 by the spring 38 and has an end attached to a control link 39 operated by a solenoid 40. Excitation of the, solenoid 40 moves the control link 39 to the right, disengaging the pawl 28 from the hold-out member 26 which then snaps back to the normal position under the action of spring 34, knocking the pawl 9 out of engagement with theslot 32. The apparatus controlling solenoid 49 is discussed at greater length in a following paragraph.

Ihe director data is received from a remote point by a self-synchronous electric motor 4| which rotates the 43 and contact member 44 in accordance therewith. The gear 43 drives the gear 45 connected to the Jack shaft 46 which rotates the dial 41 to indicate the directed fuse. settings by the action moving over the adjacently disposed scale 49.

the member 44. he entire assembly just dethe electrical connections between this switch the apparatus are established through the brushes 55 riding on the slip rings 52 and 53. The cup-switch is mounted on a suitably journaled second shaft 56 which is driven Atthe same time,

stopped or pawl 9 shaft 42 with the attached gear The contact member 44 is locat- 60 is actuated when by the gear 61 engaging the periphery of the planetary diiierential 2|. An electrical circuit is thus completed between the brushes 66 whenever the position of the casing of the planetary differential 2| corresponds to the angular position of the shaft 42 which is driven in accordance with the director data by the motor 6|, which is to say, that this circuit is completed whenever the angular position of the set ring 6 with respect to the reference ring 1. corresponds to the setting derived from the director.

The pin 68 is mounted near the periphery of the gear 51 and momentarily closes the adjacently disposed switches 69 and 60 during its passage thereby. Switch 59 is so positioned that it is actuated whenever the relative position of the set ring 6 and the reference ring I corresponds to the Safe fuse settingyand switch this relative position corresponds to the 'I-second fuse setting. The actual position of switch 60 is relatively unimportant so long as the switches are separated by a sufilcient angle to prevent overlapping operation and the '7-secondangular position was chosen in the particular application since it atiorded a convenient standard value with the projectile concerned.

The operation of the apparatus is most readily understood by consideration of the previous figures in connection with the schematic diagram of Figure 3 showing the motor I having a lead 62 connected directly to the B-phase line 6| and the leads 63 and 64 connected to the remaining two conductors of the line 6| through two contacts of the motor control relay 66. The winding of relay 66 is connected across a single phase in series with the switch 36 which is controlled by the bell crank 65. The contacts of relay 65 are normally in the open position and are moved to the closed position when the operating. winding is energized. A third set of contacts on relay 65 is connected to a single phase of line 6| through the normally closed contacts 69 of the latch release solenoid 40 and the operating winding of the light relay 66. Relay 66 is provided with two sets of contacts, one set said contacts controlling the connection of indicating lamps 61 and 68 to a source of electrical energy (not-shown). When relay 66 is in the normal or unoperated condition, the green lamp 68 is illuminated and when in the operated position, the red lamp 61 is energized. The second set of contacts on relay 66 is connected to the operating winding of the relay 66 and to the line 6| through the contacts of the solenoid switch 69. This insures that, without regard to the position of the motor control relay 66, once the red light has been illuminated, energy cannot be reapplied to the green light until the operation of solenoid 40 has released the knockout member 26, disengaging the pawl 9.

The winding of solenoid 40 is connected in series with anode circuit of the cold-cathode discharge device 10 which may be of the typecommercially designated 631191 or Strobotron. The discharge device 10 is provided with a cathode 1|, inner grid 12, outer grid 13, and anode I4. The energy for the control of solenoid 40 is derived from the transformer having a primary winding 16 connected to the line 6|, with a center tapped high voltage 11 connected to the anodes of the discharge device 18, whose cathode is energized from the secondary winding 19. A commercial vacuum tube rectifier known comuntil the pawl 8 engages the notch 3| mercially as the type 624 has been successfully employed as discharge device 18. The center tsp of winding I1 is connected to ground through resistor 86 which may have a value of 1 mesohm. A filter condenser 6| is connected between the cathodeoi tube 16 and the center tap winding I1 in parallel with the adjustable potentiometer 62. when used with 60 cycle energy a value of 10 microfarads has been found satisfactory for capacitor 6| together with a value of 100,000 ohms for potentiometer 62- The capacitor 83 is also connected across the output or rectifier 16 in series with the resistor 62. The values of capacitor 83 and resistor 8| vary with the characteristics of the solenoid and discharge devices employed, and in a particularstructure a value of 60 microfarads has been found satisfactory for capacitor 63 in conjunction'with a value of 9000 ohms for the resistor 64.

The cathode H and inner grid 12 of discharge device 10 are connected to the negative terminal of capacitor 66, and the solenoid I0 is connected between the anode I4 and the positive terminal of capacitor 66. The outer grid 16 is connected to cathode ll through resistor 66 having a value of 1 megohrn and is also connected to the control capacitor 66 through resistor 61 and the paralleled switches 88 and 69. Switch ,68 is a manually operable momentary contact switch not previously mentioned, and switch 69 represents the cup-switch previously described. The remaining terminal of control capacitor 66 is connected to cathode H.

The movable arm or potentiometer 82 is connected to the positive terminal of capacitor 66 through the load responsive pawl switch III. the momentary Safe switch 69, and one set of contacts of the delay relay 9|. The Safe switch 69 is one of the previously mentioned switches operated by the pin 68 on the gear 61. The operating winding of the delay relay BI is connected in parallel with the operating winding of light relay 66 in series with the 'l-second switch 60, which also is one of the switches operated by the pin 66 on the gear 61. Upon the movement of the contacts of relay 9| to the operated position, the lower contacts short circuit switch 60 and maintain the relay 9| in the operated position until the operation of solenoid switch 69 to interrupt the holding current. It is seen from inspection that capacitor 86 can be charged by the closure of Safe switch 69 only if the 7-second switch 60 has previously operated to operate relay 9|. Thus, until relay 9| is in the operated position, no charge can be placed on capacitor 86. The operation of the apparatus is as follows:

The insertion of the projectile 30 in the apparatus displaces push rod 21 and bell crank 36, closing switch 36 which energizes motor control relay 66. starting the operation of motor I. Operation of relay 66' closes the operating circuit of light relay 66, energizing the red light and closing a holding circuit on relay 66. The red light indicates that the fuse timing operation has not yet been completed. The motor now drives the planetary case 3 and reference ring I clockwise in the shell body, at which time the reference ring 1 ceases to rotate because of the additional imposed load.- and reference ring 6'begins to rotate in a counterclockwise direction. As the pawl 9 engages the notch 62 and picks up the load of the fuse timing ring, the switch I0 is closed. In general, the 7-second switch 60 will not have previously operated so that the subsequent passage of the fuse timing ring through the "Safe position, closing switch 59, does not charge capacitor 86.

The timing ring continues to rotate and passes through the 7-second fuse setting position, at which time,-switch 60 closes, operating relay 9| toconnect the switches l and 59 to capacitor 86. 7 As the fuse ring now passes through the Safe position, switch I0 is closed because of theload onthe pawl 9, and the switch 59 is closed,

momentarily'by the pin 58 to charge capacitor 86 in accordance with the setting'of the potentiom- Upon the continuing rotation of the eter arm 90.

set ring, the cup-switch 89 is driven by the shaft 56 and ultimately, the armiillengages the con-' tact member 44, connecting capacitor 86 to the outer grid 13 the surge anodexcurrent from the capacitor 86 knock-out member 26 which snaps back to nor-" mal position todisengage the pawl 9 from the" fuse timing ring notch 32.

store them to the normal position with their holding circuits open. The green light 69 is now illuminated, be withdrawn from the fuse setter and the next one inserted.

The inclusion of the load operated switch III of the discharge device 10. This initiates a discharge through the tube 10,,and

The final settingof V I are engaged by the contact brushes 55.

brush carrier I00, there is located the lower half 7 indicating that the projectile may insures that, should the pawl 9 fail to engage the fuse ring, no green signal will be given and the operator is informed of the fact that the set-' 1 ting operation has not been completed. If the 7-second switch with the delay relay 9| is' omitted, the setting operation on many projectiles is completed within a few tenths of a second as the projectiles are stored with the fuse in a Safe" position, and load switch HI and Safe switch 59 close simultaneously. Projectiles having fuse setting other than safety, however,,require up to 1 /2 seconds for the completion of the setting operation, as' first the pawl switch l0 op-' crates in responseto the load pick-up and later the switch 59 operates upon passage through the Safe positionf This provides a wide possible range of setting times with consequent inaccuracies in shooting.- The combination of switch 60 with its associated relay 9| and the switch 591 insures very nearly a full revolution at all times, thereby reducing the factor or variation n s tting time from 10:1 to 1.511.

When it is desired to'set a p rojectile fuse to Safe, the projectile is inserted in the-fuse setter andthe manual set safe switch 88 operated 1 bytheattendant V v V V Inthis ccnditionyofoperation the fuse setting" is independent of'the cup-switch 89, as the solenoid B0 is operated immediately upon the closure of the safe switch 59. Although'the switch 60 has been referred to as the7-second switch, it isto be understood that any other fuse timing nose of the projectile is received in a ball-bearing V tus' clear, manyof the member 44 driven providing sumcient angular separation between the Safe" anddelay. switches is satisfactory.

Although the exploded isometric view of Figure 1 makes the operational principles of the apparelconstruction'or a fuse setter have been omitted for the purpose of clarity. The sectional view of Figure 4 shows all the aforementioned parts in the positions which the assume in a practical embodiment of the invention, The instrument includes a case 92 with a removable backing plate 33 and housing 94 secured 95. The forward end of the case 92 is closed by the frontal plate 98 on which is mounted the shell indicating lamps BBbehind the colored Jewel 98,

91 is provided ience in night; operations;

the gear 43, on the shaft the two slip the exterior thereof which in this view.

A cooperatingscale 4a is afllxed to the frontal plate 98 adjacentthe dial 41 the lamp l93'with the aid of the light conducting Bosses on the plate396 pro- 7 I05 carrying a' light'baflle I01 which prevents the observer from directly view- "Lucite ring 104. vide a mounting 'for' the bezel transparentdial glass I 08 and the ing the sourceof illumination.

Also carried on the nose guide 08 mounted in the bearing cup I99 forced into the backing plate 93. As earlier described the upper movement of the push rod 21 displaces the bell crank 35 to actuate the switch 36, these parts also being mounted on the back- The knock-out member 28 is here shown in the elevated position which permits the pawl 9 to engage fuse ring notch 32 and close the pawl switch Ill. The knock-out-member 26 is slideable on the exterior of the bearing cup I09.

The planetary casin the motor Ilnot shown in: this view) and the pinions 4 and 5 iournaled in the upper and lower;

engagement with the notch 3|. take-off gear 13 is provided with layer llfl on which are l5; 'One' of the brushes an insulating 55 which engage the slip brake-drum l1 and practical details oi' the inplace b the screws with apertures V for the transmission of illumination from'thev lamp 68'tothe opening of the guide for conven- V The self-synchronous 'motor 9| is secured'tothejbacking plate 93 and of motor 4| meshing gear 45 drives theindicating dial '4'! through the shaft 46. The cup-switch 89 1s located coaxially with the shaft of motor .4! and bears On the back plate 93 is the lever Q 29 swiveled on a boss forming a part of the plate, 7

g 3 is driven clockwise by I Theset ring 7 V mounted the slip rings shaft driven by gear It in turn drives the upper sun pinion of the planetary 2|, and the lower sun pinion of planetary 2| is driven by the reference take-off gear 25 through an idler (not shown), engaging the planetary drive gear 23. As shown on the previous diagram, teeth on the exterior of the planetary housing 2| drive the gear 51 which actuates the cup 5| which is a part of the cup-switch 89. Each of the elements in this view operates in accordance with the previous description, and it is shown here to illustrate the compactness of structure which may be achieved despite the many functions performed by the apparatus.

The mounting of the spring 31 for restoring the knock-out member 26 to normal position is shown in somewhat greater detail in Figure 5. The spring is threaded to a boss I on the backing plate 93 at its lower end and is closed by the cap 2 at the upper end. Displacement of the member 26 on the bearing cup I09 stretches the spring 31 by the action of the rod 34, and the displacement of the latching pawl 28 permits the rapid return of the member 26 to the normal position under the action of spring 31.

In considering the characteristics of this apparatus, it is important to note that the planetary assembly 2| always rotates in the same direction because of the action of the unidirectional brake and that the accuracy of the positioning is therefore substantially unaffected by the employment of fairly large tolerances on the gears. Although a differential mechanism has been shown for imparting relative motion to the set and reference rings, it is to be understood that any other method of producing the desired motion may be employed.

It will be obvious that many changes and modifications may be made in the invention without departing from the spirit thereof as expressed in the foregoing description and in the appended claims.

We claim:

1. In apparatus for setting relatively rotatable members to a predetermined angular position, a rotatable reference ring, means carried by said reference ring for engaging one of said members, a rotatable set ring, a resiliently mounted pawl carried by said set ring, motor means relatively driving said reference ring and said set ring, holdout means normally maintaining said set pawl in disengaged position, means displaceable upon the insertion of a body bearing said members, latching means connecting said holdout means and said displaceable means, electromagnetic means for operating said latching means, differential means responsive to the relative an gular position of said reference ring and said set ring, means responsive to data transmitted from a remote point, a momentary electric switch jointly responsive to said differential means and to said data responsive means connected to said electromagnetic means, a manually operable switch connected in parallel with said momentary switch, a load operated switch controlling the response of said electromagnetic means to said paralleled switches, and a pair of switching means sequentially responsive to the relative rotation of said reference ring and said set ring for controlling the response of said electromagnetic means to said electrical switching means.

2. In apparatus for setting relatively rotatable members to a predetermined angular position, a rotatable reference ring, means carried by said reference ring for engaging one of said members,

a rotatable set ring, a resiliently mounted pawl carried by said set ring, motor means relatively driving said reference ring and said set ring, holdout means normally maintaining said set pawl in disengaged position, means displaceable upon the insertion of a body bearing said members, latching means connecting said holdout means and said displaceable means, electromagnetic means for operating said latching means, difierential means responsive to the relative angular position of said reference ring and said set ring, means responsive to data transmitted from a remote point, a momentary electric switch jointly responsive to said differential means and to said data responsive means connected to said electromagnetic means, a manually operable switch connected in parallel with said momentary switch, a loadoperated switch controlling the response of said electromagnetic means to *said paralleled switches, and switching means responsive to the relative rotation of said reference ring and said set ring for controlling the response of said electromagnetic means to said paralleled switches.

3. In apparatus for setting relatively rotatable members to a predetermined angular position, a reference member, means carried by said reference member for engaging one of said rotatable members, a rotatable set ring, means carried by said set'ring for engagingthe other of said rotatable members, motor means driving said set ring, means responsive to the relative angular position of said reference member and said set ring for disengaging said means carried by said set ring from said rotatable member, and means for preventing said disengagement for predetermined values of relative rotation between said reference member and said set ring.

4. In apparatus for setting relatively rotatable members to a predetermined angular position, a rotatable reference ring, means carried by said reference ring for engaging one of said members, a rotatable set ring, means carried by said set ring for engaging the other of said members, motor means for relatively driving said referenee ring and said set ring, means responsive to the relative angular position of said reference ring and said set ring for disengaging said means carried by said set ring from said member, and means for preventing said disengagement for predetermined values of relative rotation between said reference ring and said set ring.

5. In apparatus for setting relatively rotatable members to a predetermined angular position, a rotatable reference ring, means carried by said reference ring for engaging one of said members, a rotatable set ring, a displaceably mounted pawl carried by said set ring for engaging the other of said members, motor means relatively driving said reference ring and said set ring, holdout means normally maintaining said set pawl in disengaged position, means displaceable upon the insertion of a body bearing said members, latching means connecting said holdout means and said displaceable means, electromagnetic means for operating said latching means, differential means responsive to the relative angular position of said reference ring and said set ring, means responsive to data transmitted from a remote point, electrical switching means jointly responsive to said differential means and to said data responsive means-connected to said electromagnetic means, a load operated switch controlling the response of said electromagnetic means to said electrical switchmeans and to said data nected to said electromagnetic means, a load carried by said ing means, and a pair ofswitches sequentially responsive to the relative rotation of said reference ring andsaid set ring for controlling the response of saidelectromagnetic means tosaid electrical switching means, one of said last mentioned switches being connected in series with said load operated switch and the other of said last mentioned switches controlling means for connecting said load operated switch, said first mentioned electrical switching means and said firstmentioned sequentially operated switch in v series. a

6. In apparatus for setting relatively rotatiable members to a tion, a rotatable reference ring, means carried by said reference ring for'engaging one of said members, a rotatable set ring, a resiliently mount- 7 ed pawl carried relatively driving said reference ring and said set ring, holdout means normally maintaining said set pawl indisengaged position, means disp l aceable upon the'insertion of a body bearing byesaid set ring, motor means fuse time ring,a rotatable reference means responsive to tion of said reference ring and said set ring for restoring said holdout means'to'said normal position, load responsive interlock? means for preventing said restoration for predetermined loads, and meansresponsive to the relative irotation of said reference ring and said set ring for preventingsaid restoration until said relative rotation exceeds a predetermined value. 1

9. In apparatus for the setting of a projectile ring, means carried by said reference, ring'for engagingthe predetermined angular po'si maintaining said set pawl in disengaged position, mean operable uponv the insertion of a projectile to displace said holdoutmeans, means respon= a sive'to the relative angular position of said refbody of a projectile, a'rotatable set ring, a resil- 'ientlymounted pawl carried by .said set ring,

motor means relatively driving said reference ring and said setring, holdout means normally a erence ringiandsaid set ringifor restoring said said members, latching means connecting-said V holdout means and said displaceable means. electromagnetic means for operating said latching means, differential. means mitted from a remote point,electrical switching means jointlyresponsive to said differential responsive to the rela tive angular position of said referencering and saidset ring, means responsive to data transresponsive means con ceeds a predetermined value. V i V r 10. In apparatus for. the setting of a projectile carried by said operated switch controlling the response of said electromagnetic means to said electrical switching means, and a pair of switching means sequentially responsive to said reference ring and said set ring forcontrolling the response of said electromagnetic means to said electrical switching means. 7

7. In apparatus for the setting of. a projectile fuse time ring, a rotatable reference ring, means reference'ring for engaging the the relative rotation of holdout means to saidinormal position, and means responsivetothe relative rotation of'said reference ring andsaid set ring for preventing said restoration until said relative fuse time ring,

body of a projectile, a rotatable set ring, a resiliently mounted pawl carried by said set ring motor means relatively drivingsaid reference ring ,and said'set ring, holdout meansnormally maintaining said set pawl inv disengaged "posibody of a projectile, a rotatable set ring, a'resiliently mounted pawl carried by said set ring,

motor means relativelydriving said reference 7 ring and said set ring, holdout means normally maintaining said set means displaceable pawl in disengaged position. upon the insertion of a projectile, latching means connecting said holdout means and said magnetic means displacable means, electrofor operating said latching means, diiferential means responsive to'the relative angular position of said referencering and said set ring, means responsive to data transmitted from a remote point, electrical switching means jointly responsive to said differential means and to said data responsive means connected to said electromagnetic means, a load operated switch controlling the response of said electromagnetic means to said electrical switching means, and switching means responsive to the relative rotation of said reference ring and said set ring forcontrollingthe response of said electromagnetic means to said electrical SWltCl'le ing means.

' 8. In apparatus for jectile fuse'time ring, a rotatable reference ring, means'carried by said reference ring for .en-. gaging the body of a projectile, a rotatable set ring, a resiliently mounted pawl carried by said set ring, motor means relatively. driving said reference ring and said set'ring, holdout means normally maintaining said set pawl in disengagedposition, means operable upon the insertion of a projectile to displace said holdout means,

fuse time ring,

, V 65, the settingof a protion, means operable upon the insertion of a projectile to displace said holdout means, means responsive to the relative angular'position of said reference ring and said set ring for re,

storing. said holdoutmeans to said normal position, and load responsive interlock means for" preventing said restoration for V predetermined loads. V V 11. In apparatusforthe setting of a projectile fuse time ring, a rotatable reference ring, means carried by said reference ring for; engaging the body of a projectile, a

rotatable set ring, a resil iently mounted pawl carried by said set ring, motor means relatively driving said reference ring and said set ring, holdout'means normally mainposition,

taining said set pawl in disengaged means; displaceable upon the insertion of a projectile, latching means connecting said holdout means and said displaceable means, electromagnetic means for controlling said latching means,

a load operated switch controlling said electromagnetic means, differential means responsive to r V the relative angular position ofsaid reference ring and said set ring, means responsive to data transmitted from a remote point, and electrical switching'means connected tosaid electromagnetic means jointly responsive to said differential means and to said data responsive means.

12; In apparatus for the setting of a'projectile a rotatable-reference ring,'means carried by? said means for restraining the'rotation ofjsaid set ring ina predetermined directionpmotor means relatively driving said reference ring andv said set ring, holdout means normally maintaining said pawl in disengaged position, means operable upon a projectile to displace said holdout means and initiate the operation of said motor means, differential means responsive to the l the relative angular posirotation ex-j a rotatable reference ring, means reference ring for engaging the reference ring for engaging the bodyof a projectile, a rotatable set. ring, a resil;

iently mountedpawlcarried by said set ring,

relative angular position of said reference ring and said set ring, means responsiveto data transmitted from a remote point, and means jointly responsive to said differential means and to said data responsive means for restoring said holdout means to said normal position and discontinuing the operation of said motor means.

13. In apparatus for the setting of a projectile fuse time ring, a rotatable reference ring, means carried by said reference ring for engaging the body of a projectile, a rotatable set ring, a resiliently mounted pawl carried by said set ring,

means for restraining the rotation of said set ring in a predetermined direction, motor means relatively driving said reference rin and said set ring, holdout means normally maintaining said set pawl in disengaged position, means operable upon the insertion of a projectile to displace said holdout means, diiferential means responsive to the relative angular. position of said reference ring and said set ring, means responsive to data transmitted from a remote point, and

-means jointly responsive to said differential jectile, latching means connecting said holdout means and said displaceable means, electromagnetic means for controlling said latching means, differential means responsive to the relative angular position of said reference ring and said set ring, means responsive to data transmitted from a remote point, and electrical switching means connected to said electromagnetic means jointly responsive to said differential means and to said data responsive means.

15. In apparatus for the setting of a projectile fuse time ring, a rotatable reference ring, means carried by said reference ring for engaging the body of a projectile, a rotatable set ring, a resiliently mounted pawl carried by said set ring, motor means relatively driving said reference ring and said set ring, holdout means normally mamtaining said set pawl in disengaged position, means displaceable upon the insertion of a projectile latched to said holdout means, and means responsive to the relative angular position of said reference ring and said set ring for unlatching said holdout means and said displaceable means.

16. In apparatus for the setting of a projectile fuse time ring, a rotatable reference ring, means carried by said reference ring for engaging the body of a projectile, a rotatable set ring, a resiliently mounted pawl carried by said set ring, motor means' relatively driving said reference ring and said set ring. holdout means normally mintaining said set pawl in disengaged position, means operable upon the insertion of a projectile to displace said holdout means, electromagnetic means for restoring said holdout means to said normal position, differential means responsive to the relative angular position of said reference ring and said set ring, means responsive to data transmitted from a remote point, and electrical switching means connected to said electromag netic means jointly responsive to said differential means and to said data responsive means.

17. In apparatus for the setting of a projectile fuse time ring, a rotatable reference ring, means carried by said reference ring for engaging the body of a projectile, a rotatable set ring, a resiliently mounted pawl carried by said set ring, motor means relatively driving said reference ring and said set ring, holdout means normally maintaining said set pawl in disengaged position, means operable upon the insertion of a projectile to displace said holdout means, differential means responsive to the relative angular position of said reference ring and said set ring, means responsive to data transmitted from a remote point, and means jointly responsive to said differential means and to said data responsive means for restoring said holdout means to said normal position.

18. In apparatus for the setting of a projectile fuse time ring, a rotatable reference ring, means carried by said reference ring for engaging the body of a projectile, a rotatable set ring, a resiliently mounted pawl carried by said set ring, motor means relatively driving said reference ring and said set ring, holdout means normally maintaining said set pawl in disengaged position. means operable upon the insertion of a projectile to displace said holdout means, and means responsive to the relative angular position of said reference ring and said set ring for restoring said holdout means to said normal position.

19. In apparatus for the setting of a projectile fuse time ring, a rotatable reference ring, a pawl engaging the body of a projectile carried by said reference ring, a rotatable set ring, a pawl engaging said time ring carried by said set ring, motor means in driving connection with said reference ring and said set ring, and means responsive to the relative angular position of said reference ring and said set ring for disengaging said pawl carried by said set ring from said time ring.

20. In apparatus for the setting of a projectile fuse time ring, a rotatable reference ring, means carried by said reference ring for engaging the body of a projectile, a rotatable set ring, means carried by said set ring for engaging said time ring, motor means in driving connection with said reference ring and said set ring, and means responsive to the relative angular position of said reference ring and said set ring for disengaging said means carried by said set ring from said time ring.

RALPH R. CHAPPELL. RUTGER B. COLT. 

